RuStore support

[PadowYT2]

Added support for RuStore (based on this gist) and removed obsolete apps. This is my first time developing in Dart, so obvioulsy this doesn't work.

The current error is type 'Null' is not a subtype of type 'String', which I have no idea how to debug and where it is coming from. I appreciate if someone knows Dart could help on this.

An another problem, when getting a download link, it is a zip, which has an apk inside of it named file. The problem is, I have no idea how to implement this unfortunately You can replace .zip with .apk and it would work (mentioned on #2081 (comment))

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Closes #1593

[arisudesu]

For some reason, apkUrl can now contain a URL that ends with .zip and gives a ZIP file containing APK, instead of giving APK directly. This may be not supported in Obtainium. For now, replacing .zip extension to .apk in URL reverts RuStore to previous behavior, I don't know for how long it will work though.

[arisudesu]

Example for ru.sberbankmobile:

$ curl -s -X POST 'https://backapi.rustore.ru/applicationData/download-link' -d '{"appId":"462271","firstInstall":true}' -H 'Content-type: application/json' | jq

{
  "code": "OK",
  "message": "OK",
  "body": {
    "appId": 462271,
    "apkUrl": "https://static.rustore.ru/apk/462271/version/2025010912/66a45791-5384-4940-adb5-bca7b01a3f11.zip",
    "versionCode": 2025010912
  },
  "timestamp": "2025-01-26T19:48:53.588472302+03:00"
}

[PadowYT2]

@ImranR98 Any ETA on taking a look at this?

[ImranR98]

Not at the moment. Will take a look at some point.